Polamalu is a game changer. Now, I know he has been prone to injury in the past few years but it is definitely a risk worth taking. He wins games for us. Take the 2009 season - how weak was our secondary without Polamalu? Troy changes the way quarterbacks and WR's think and does account for more interceptions, YPC and disruptions than his personal statistics indicate. He is someone who must be accounted for in every snap by offenses (refer Joe Flacco and Baltimore OL). Not only does he do a great job in pass defense, but he is even more phenomenal in stopping the running game.